Access character at index in string
Use charAt() to get a character at the specified index in the string.
var string = "Hello, World!";
console.log( string.charAt(4) ); // "o"
Alternatively, because strings can be treated like arrays, use the index via bracket notation.
var string = "Hello, World!";
console.log( string[4] ); // "o"
To get the character code of the character at a specified index, use charCodeAt().
var string = "Hello, World!";
console.log( string.charCodeAt(4) ); // 111
Note that these methods are all getter methods (return a value). Strings in JavaScript are immutable. In other words, none of them can be used to set a character at a position in the string.